Since he was given antibotics...I would guess the diagnosis was kennel cough. Sometimes it takes quite a while for this to go away.
No he won't die from reverse sneezing. When he does it...place your fingers across his nostrils...this will force him to breathe out of his mouth and the "honking" will stop.
And I don't understand what you mean about his heart? There aren't any bones in their hearts. Do you mean valves? There are 4 valves in a dog's heart.
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